package com.example.drools.spring.utils;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;

/**
 * @author ddsyw
 * @version 1.0
 * @date 2021-11-30 13:56
 */
@Slf4j
public class JacksonUtil {
  private static ObjectMapper mapper = new ObjectMapper();

  /**
   * 对象转json
   *
   * @param object
   * @return
   */
  public static String toJsonString(Object object) {
    try {
      return mapper.writeValueAsString(object);
    } catch (JsonProcessingException e) {
      log.error("json to String error:{}", e);
    }
    return null;
  }

  /**
   * json转对象
   *
   * @param json
   * @param clazz
   * @param <T>
   * @return
   */
  public static <T> T jsonToBean(String json, Class<T> clazz) {
    try {
      return mapper.readValue(json, clazz);
    } catch (JsonProcessingException e) {
      log.error("json to bean error:{}", e);
    }
    return null;
  }

  /**
   * 字符串转换为List
   *
   * @param listStr
   * @param typeReference new TypeReference<List<Object>>() {}
   * @param <T>
   * @return
   */
  public static <T> T jsonToObjByTypeRf(String listStr, TypeReference<T> typeReference) {
    try {
      return mapper.readValue(listStr, typeReference);
    } catch (JsonProcessingException e) {
      log.error("json to obj by typer Rf e:{}", e);
    }
    return null;
  }
}
